JPS6099619A - Mold assembly - Google Patents

Abstract

PURPOSE:To obtain a mold assembly for a resin molded piece capable of holding a push button by a click and omitting the welding process for another piece by comprising a slidable core insert forming an undercut part, its subsidiary springs, releasing projection pin. CONSTITUTION:The desired mold assembly for the resin part 8 is obtained by comprising the slidable core insert 10 for forming the undercut part 9, the spring 11 for helping the slide of the core insert 10 and the projection pin 12 for releasing the molded piece from the mold. The core insert 10 projects until the collar of the core insert 10 comes into contact with the core body 7, is projected further by the projecting pin 12 to release the resin part 8 from the mold. EFFECT:Clicks of the molded resin part is prevented from permanent deformation due to forced removal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a mold apparatus for processing undercuts.

Structure of conventional example and its problems Conventionally, as shown in FIG. When ejecting, the pin must be slid to release it. Therefore, the conventional undercut had the disadvantage that it required a space for the four pins to fit and a shape that allowed it to slide.

OBJECTS OF THE INVENTION The present invention provides a mold device that can process shapes that cannot be released from the mold in conventional spaces, in order to eliminate the drawbacks of the prior art and to expand the range of functions of resin parts.

Structure of the Invention Since the present invention has two undercut shapes close to each other, the mold device requires a core insert that is set to be slidable and that forms the two undercut portions, and a core insert that is configured to be slidable to form the two undercut portions. This mold device is simple in terms of mold structure, consisting of an auxiliary spring and a protruding pin that releases the resin part from the mold.

DESCRIPTION OF EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In Figures 2 to 4, 6 is a cavity, 7 is a core body, 8 is a resin part, 9 is an undercut part, 10 is a slidable core insert that forms the undercut 9, and 11 is a core insert of the core insers 1 and 10. Spring to assist sliding,
12 is the protruding pin for releasing the resin part, 13 is the core body 7 (;J, determine the height of the core insert 10,
This is a template that supports the spring 11. The core body 7 is provided with a hole into which a core insert 10 slides and into which a spring can be set. FIG. 2 shows the state of the mold device in the example during molding. FIG. 3 shows the state at the time of initial ejection. The resin part 8 is projected by the ejecting pin 12 and is completely released from the core body 7, but the undercut portion 9 is not released from the core insert 10.

The core insert 1o has an undercut portion 9 and a spring 11.
The protruding or slidable stroke, i.e. the collar of the core insert 10, together with the resin part 8 is connected to the core body 7.
Protruded by the ox that touches the.

FIG. 4 shows a state in which the core insert 1o is further ejected by the ejecting pin 12 after its sliding is restricted. Core insert 1 of undercut part 9 of resin part 8
Release from 0 takes advantage of the elasticity of the material of the molded product, and the claws of resin parts molded at 0 or more are removed by force removal by twisting and twisting in the direction of the arrow X. No permanent distortion occurs, and resin parts can be molded without losing their functionality.

Effects of the Invention As described above, the present invention makes it possible to form undercuts in resin parts in shapes that were impossible with conventional undercut molding devices. As a result, the push button holding part of the video front panel was conventionally done by welding a separate piece, but now the push button can be held with a pawl, and since it can be integrally molded, a separate piece is no longer required.
It is also possible to reduce the welding process for separate pieces, resulting in significant cost reductions. Furthermore, since it can be used for purposes other than video front panels, its practical effects are great.

[Brief explanation of drawings]

Figures 1 (a) and (b) are cross-sectional views of a mold showing an outline of conventional undercut processing, Figure 2 is a cross-sectional view of a mold in an embodiment of the present invention, and Figure 3 is an initial protrusion. FIG. 4 is the same cross-sectional view showing the later stage of protrusion. 1.6...Cavity, 2. γ...Core body, 3.8...Resin parts, 4°...Pin,
6, 9...undercut part, 10...
Core insert, 11... Spring, 12...
Ejector pin, 13...template. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure ↑ Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Assembling of resin molded parts - Pressure generating means for making the mold insert forming the catching part of the pawl provided in the resin part used for etc. slidable in the mold opening direction, and facilitating sliding with the mold insert. A mold device equipped with ejector pins that release molded parts from the mold.